DAC ouput using Transformer - Page 20

Zen Mod · 14th May 2010, 12:43 PM

Quote:

Originally Posted by juma

Those two sch. are not equivalent, .......

clarify , please

juma · 14th May 2010, 12:58 PM

Quote:

Originally Posted by Zen Mod

clarify , please

Clarify yourself !

Zen Mod · 14th May 2010, 01:03 PM

Sipi is my friend ;

you're baaad Juma !

juma · 14th May 2010, 01:10 PM

Quote:

Originally Posted by Zen Mod

....you're baaad Juma !

YouTube - George Thorogood - Bad to The Bone

Zen Mod · 14th May 2010, 01:27 PM

George Thorogood - Get a Haircut

AR2 · 14th May 2010, 03:15 PM

Juma, thank you for taking look and analyzing. Guys I am little bit unclear. Outside of changing the value of resistor, is there anything wrong with the circuit, because I am just a few days off before sending it for PCB fabrication?
Thanx
AR2

Zen Mod · 14th May 2010, 03:36 PM

you can use bigger resistors ( in value , not size

) . bigger caps , you can use jumper instead of first darlington ;

make these pcbs , and try later what's better .

stokessd · 14th May 2010, 03:58 PM

Speaking of PCB fabrication, I'm doing a layout for a new DAC that will be part of my music streaming systems placed around the house. I wanted low power consumption that I could leave on all the time, so I'm using a 2022 based tripath amp being driven by an airport express. I'm building these DACs for better sound from the AE. The DAC design uses a pair of Lundahl LL1690's on the output, so it's germane to this thread (I started a new thread about it, but I'm just getting crickets).

I'm going to have some boards made and if anybody would like to go in on some, I'll adjust my order accordingly.

The other thread is here:
Yet Another Crystal DAC with Lundahl Outputs

Groundloops · 07:47 PM

Is that a nice square wave? 1kHz with 8.9kΩ load (pot before preamp) across secondaries, no resistor(s) on primaries.

Connection diagram:

Groundloops · 22nd May 2012, 04:00 PM

I found this very helpful to explain the waveform above, so I want to give this as a reference: I tried to tame the slight overshoot, but had no succes with whatever RC combination.

Far from being obvious, this (klick it) made me stop any further attempts ...

14th May 2010, 01:03 PM	#193
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	Sipi is my friend ; you're baaad Juma ! __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

14th May 2010, 01:27 PM	#195
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	George Thorogood - Get a Haircut __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

14th May 2010, 03:15 PM	#196
AR2 Master Burner Join Date: Dec 2002 Location: San Francisco, California	Juma, thank you for taking look and analyzing. Guys I am little bit unclear. Outside of changing the value of resistor, is there anything wrong with the circuit, because I am just a few days off before sending it for PCB fabrication? Thanx AR2 __________________ www.burningamp.com October 1, 2011

14th May 2010, 03:36 PM	#197
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	you can use bigger resistors ( in value , not size ) . bigger caps , you can use jumper instead of first darlington ; make these pcbs , and try later what's better . __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

16th May 2012, 07:46 PM	#199
Groundloops I´m amazed! diyAudio Member Join Date: May 2004 Location: Hamburg / Northern Germany	o'scope screen picture: Lundahl LL1690 on Buffalo (ES9008) DAC with 8.9Ω load Is that a nice square wave? 1kHz with 8.9kΩ load (pot before preamp) across secondaries, no resistor(s) on primaries. Connection diagram: Last edited by Groundloops; 16th May 2012 at 07:47 PM. Reason: typo


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14th May 2010, 03:58 PM	#198
stokessd diyAudio Member Join Date: Nov 2002 Location: Fort Wayne, IN	Speaking of PCB fabrication, I'm doing a layout for a new DAC that will be part of my music streaming systems placed around the house. I wanted low power consumption that I could leave on all the time, so I'm using a 2022 based tripath amp being driven by an airport express. I'm building these DACs for better sound from the AE. The DAC design uses a pair of Lundahl LL1690's on the output, so it's germane to this thread (I started a new thread about it, but I'm just getting crickets). I'm going to have some boards made and if anybody would like to go in on some, I'll adjust my order accordingly. The other thread is here: Yet Another Crystal DAC with Lundahl Outputs

22nd May 2012, 04:00 PM	#200
Groundloops I´m amazed! diyAudio Member Join Date: May 2004 Location: Hamburg / Northern Germany	Overshoot in square wave form I found this very helpful to explain the waveform above, so I want to give this as a reference: I tried to tame the slight overshoot, but had no succes with whatever RC combination. Far from being obvious, *this* (klick it) made me stop any further attempts ...

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